<?php

/*
 *      osfield.php
 *      
 *      Copyright 2011 Vitaliy Rakitin <virak@ukr.net>
 *      
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *      MA 02110-1301, USA.
 */

require_once($_SERVER['DOCUMENT_ROOT']."/classes/System/iobservable.php");

class osfield implements iobservable {
	
	private $value;
	private $meta;
	private $observers = array();
	
	function __construct($meta) {
		$this->meta = $meta;
		$this->value = $this->meta->defaultvalue;
	}
	
	function addObserver($observer) {
		$this->observers[] = $observer;
	}
	
	function __set($name, $value) {
		if ($name == "value") {
			foreach($this->observers as $obs)
				$obs->observable_before_changed($this, $value);
			$this->value = $value;
			foreach($this->observers as $obs)
				$obs->observable_after_changed($this, $value);
		}
	}
	
	function __get($name) {
		if ($name == "value") { return $this->value;}
		if ($name == "meta") { return $this->meta;}
	}
}
?>

